<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="https://cdn.jsdelivr.net/npm/vue@2.7.14/dist/vue.js"></script>
</head>
<body>
  <div id="app">
    <span>全选:</span>
    <input type="checkbox" v-model="isAll"/>
    <button @click="ends">反选</button>
    <ul>
      <li v-for="item in arr" :key="item.name" >
        <input type="checkbox" v-model="item.checked" />
        <span>{{item.name}}</span>
      </li>
    </ul>
  </div>
  <script>
    const app = new Vue({
      el: '#app',
      data: {
        arr: [
          {
            name: "猪八戒",
            checked: false
          },
          {
            name: "孙悟空",
            checked: false
          },
          {
            name: "唐僧",
            checked: false
          },
          {
            name: "白龙马",
            checked: false
          }
        ]
      },
      methods:{
        ends(){
            this.arr.map(item=>item.checked=!item.checked)
        }
      },
      computed:{
        isAll:{
            get(){
                return this.arr.every(item=>item.checked)
            },
            set(val){
                this.arr.forEach(item=>item.checked=val)
            }
        }
      }
    })
  </script>
</body>
</html>